Industry news--Karmin Electronic (HK) Limited

Littelfuse introduces the TPSMD-FL series TVS diodes for simplifying ISO 7637 load dump protection
2026-08-27

FlatSuppressX ™ Technology can provide low and stable clamping voltage, helping automotive designers meet the requirements of ISO 7637-2 Pulse 5b with fewer protective components.

Littelfuse, a leading company providing diversified and advanced solutions for safe and efficient power transmission, announced today the launch of FlatSuppressX ™ The TPSMD-FL series TVS (Transient Suppression) diode is a new series of automotive grade transient voltage suppression devices designed to simplify ISO 7637-2 Pulse 5b load drop protection for 12V automotive electronic devices.

Traditional TVS diodes can raise transient voltage to a level that requires additional protection circuits, while the TPSMD-FL series uses proprietary FlatSuppressX ™ Technology maintains a low, flat, and stable clamp voltage curve during high-energy transient events. This enables designers to meet stringent automotive load drop requirements with lower clamping voltage and fewer external components, thereby reducing design complexity, PCB space occupation, and overall system cost.

The TPSMD-FL series TVS diode can withstand a peak pulse power of 3000 W and is packaged in a compact surface mount DO-214AB package. After optimization, it can protect sensitive automotive electronic devices from high-energy surges. This device complies with the AEC-Q101 standard and is designed specifically for applications that require compliance with the ISO 7637-2 Pulse 5b load drop standard.

Protecting increasingly sensitive electronic devices from the impact of high-energy load transients without increasing system costs and complexity remains a continuous challenge for automotive designers, "said Charlie Cai, Director of Product Management at Littelfuse's Protection Products Division. The innovative TPSMD-FL series FlatSuppressX ™ TVS diodes address this challenge by providing extremely low clamping voltage performance, which can help the system meet the requirements of ISO 7637-2 Pulse 5b without the need for additional protective devices, thereby reducing the number of components and overall BOM costs.

The main functions and advantages include:

•Excellent low clamping performance
• FlatSuppressX ™ The technology has advanced hysteresis I-V characteristics, which can maintain low and stable clamping voltage during transient events
•3000 W peak pulse power dissipation capability, providing powerful surge protection
•Designed to withstand ISO 7637-2 pulse 5b load transients in 12V automotive systems
• Complies with AEC-Q101 automotive reliability requirements
•Compact DO-214AB surface mount package helps optimize circuit board space
•EC 61000-4-2 ESD protection for air and contact discharges up to 30 kV

The TPSMD-FL series TVS diodes are highly suitable for automotive applications that require protection against sudden load drops, including zone control modules, powertrain electronics, infotainment systems, body control modules, and other vehicle electronic subsystems operating on a 12V power network.

FAQ: TPSMD-FL series FlatSuppressX ™ TVS diode

1.What is the difference between the TPSMD-FL series and traditional TVS diodes?
The TPSMD-FL series uses proprietary FlatSuppressX ™ Technology can maintain a flatter and lower clamping voltage during transient events while avoiding latch up risks. This helps to more effectively protect downstream electronic devices without the need for additional protective components.

2.What automotive standards does the TPSMD-FL series aim to meet?
This series is designed specifically for ISO 7637-2 Pulse 5b load drop protection in 12V automotive systems. When the battery accidentally disconnects while the AC generator is in a charging state, such high-energy transients can occur.

3.What are the most suitable automotive applications for the TPSMD-FL series?
Typical applications include regional controllers, powertrain electronics, infotainment systems, vehicle electronics, and other sensitive vehicle control modules connected to the 12V power bus.

4.How can the TPSMD-FL series help reduce system costs?
Due to the extremely low clamping voltage performance of these devices, designers do not need to add a second level of protection to meet the requirements of sudden load drops. This can reduce the number of components, PCB area, and overall BOM cost.

5.What reliability requirements does the TPSMD-FL series meet?
This device complies with the AEC-Q101 standard and is suitable for automotive applications, providing peak pulse power dissipation capability of up to 3000 W. It also supports IEC 61000-4-2 ESD protection, up to 30 kV air and contact discharge.

6. What packaging options are available?
The TPSMD-FL series adopts a compact surface mount DO-214AB package, which can provide high surge protection while minimizing circuit board space.

7.Does the TPSMD-FL series support the next-generation vehicle architecture?
Yes. The low clamping voltage, high surge protection capability, and compact size make these devices highly suitable for modern regional architectures and increasingly distributed automotive electronic systems.

Supply situation

TPSMD-FL series FlatSuppressX ™ TVS diodes are available in tape packaging, with a minimum order quantity of 3000 units. Request samples through any authorized Littelfuse distributor worldwide.

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